30 system architect jobs at 24 companies in O'Fallon, MO
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Senior System Architect
Denver or St. Louis or Sterling or Springfield
$99k-$207k/yr OnsiteFull Time
8+ YOETS/SCI clearance with polygraph eligibility, 8+ years systems/software engineering with architecture leadership, experience with large distributed cloud-native systems, SAFe, APIs, and strong stakeholder communication.
SAFe, APIs
4w
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Senior System Architect
Denver or Springfield or Sterling or St. Louis
$99k-$207k/yr OnsiteFull Time
8+ YOETS/SCI clearance required, bachelor's in CS/Engineering or equivalent, 8+ years systems/software engineering with architecture leadership, experience with cloud-native distributed systems, Agile/SAFe environments, strong communication.
Agile, SAFe
1mo
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System Architect — MDDI / MBSE
Scott Air Force Base, Illinois, United States
OnsiteFull Time
10+ YOE10+ years enterprise architecture/systems engineering, 3+ years MBSE on large DoD or federal programs, SysML and MBSE tool proficiency, SAP S/4HANA familiarity, API/messaging integration, RMF/NIST/Zero Trust alignment, active DoD clearance or eligibility, bachelor's degree.
CACI MDDI, SysML, Cameo Systems Modeler, MagicDraw, Capella, Rhapsody, SAP S/4HANA, REST, SOAP, Kafka, API gateways, DoDI 5000.97, RMF, NIST 800-53, NIST 800-207, DoD SRG IL4/IL5, DoDAF, TOGAF
2d
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Core Banking System Architect - Director
New York City or Raleigh or Charlotte or Chicago or Cincinnati or Cleveland or Columbia or Columbus or Dallas or Baltimore or Richmond or Rochester or Rosemont or Sacramento or Boston or St. Louis or Salt Lake City or San Antonio or San Diego or San Francisco or Seattle or Spartanburg or Albany or Stamford or Tampa or Atlanta or Toledo or Austin or Tulsa or Washington or Denver or Des Moines or Detroit or Buffalo or Florham Park or Fort Worth or Greensboro or Hartford or Houston or Grand Rapids or Indianapolis or Irvine or Jacksonville or Kansas City or Las Vegas or Little Rock or Los Angeles or Louisville or Birmingham or Fayetteville or Melville or Miami or Milwaukee or Minneapolis or Montpelier or Nashville or New Orleans or United States or Oklahoma City or Orlando or Philadelphia or Phoenix or Pittsburgh or Portland
$155k-$410k/yr HybridFull Time
9+ YOEBachelor's degree and 9+ years of experience required; expertise in Agile, Business Architecture, cloud platforms, Enterprise Architecture, and Application Integration.
Agile Methodology, Business Architecture, AWS, Google Cloud, Azure, Enterprise Architecture, Application Integration
2w
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System Engineer (Cloud)
Scott Air Force Base, Illinois, United States
OnsiteFull Time
10+ YOEBachelor's degree with 10+ years experience, IAT Level III and CE cloud certifications, cloud architect/engineer experience (Azure preferred), Redhat Linux, Palo Alto, AWS skills, and mentoring ability.
Git, Jenkins, Groovy, YML, AWS, WAF, GuardDuty, Security Groups, IAM, EC2, S3, System Manager, CloudFormation, CloudTrail, Lambda, Workspaces, Route 53, Panorama, Big IQ, F5, Big-IP, LTM, ASM, Transit Gateway, Redhat Enterprise Linux, BGP, VPNs
1mo
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Senior System Engineer – ArcGIS (Mission-Focused)
Vienna or St. Louis
$156k-$239k/yr OnsiteFull Time
12+ YOE12+ years experience architecting and administering enterprise ArcGIS and IT systems; US citizenship with active Top Secret/SCI clearance; bachelor's degree in CS, Math, GIS or STEM; proficiency with Python/PowerShell and RDBMS.
ArcGIS Enterprise, ArcGIS Desktop, ArcGIS Online, Portal for ArcGIS, ArcGIS Runtime, Python, PowerShell, Javascript, C#, SQL Server, Oracle, PostgreSQL, Windows, Linux
3w
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Solution Architect
Saint Louis, Missouri, United States
$117k-$151k/yr HybridFull Time
7+ YOEBachelor's degree or equivalent experience, 7+ years in solution architecture or related discipline, experience with C4 diagrams, cloud (Microsoft Azure) familiarity, system integration and APIs, strong communication and problem-solving, U.S. work authorization required.
C4, Microsoft Azure, CI/CD, infrastructure-as-code, containerization, observability, SAFe, TOGAF
3d
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^Technology Architect - 6426622
St. Louis or Bentonville or California or Cleveland or Colorado or District of Columbia or Illinois or Maine or Maryland or Massachusetts or Minnesota or New York or New Jersey or Virginia or Washington
$70-$80/hr OnsiteFull Time, Temporary
10+ YOERequires 10+ years in application architecture and Java, 5+ years in distributed systems, 3+ years in event-driven systems, 10+ years in RDBMS, and 1+ year using Claude Code or Codex.
Claude Code, Codex, SQL, Java, Spring Boot, Azure, Kafka, RDBMS, Microsoft Excel
2w
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Enterprise Architect SME
Scott Air Force Base, Illinois, United States
$110k-$130k/yr OnsiteFull Time
8+ YOE8+ years in enterprise or systems architecture, experience with EA policies/processes, Common Architecture Tool Suite (CATS), strong analysis and communication, ability to brief senior leadership.
Common Architecture Tool Suite (CATS)
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Senior Payments Architect
Saint Louis, Missouri, United States
$92k-$203k/yr OnsiteFull Time
Design and own payment platform architecture, lead integrations with PSPs/acquirers and banks, ensure ledger correctness, embed PCI-compliant security, and guide teams on resilient distributed payment systems.
Spreedly, Gr4vy, Primer, BR-DGE, AWS, GCP, Azure, Kafka
1mo
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Lead Application Architect
San Francisco or St. Louis or Cleveland or Philadelphia or Chicago or New York City or Kansas City or Boston or Atlanta or Minneapolis or Dallas or Richmond
$164k-$263k/yr OnsiteFull Time
10+ YOEExtensive Saviynt or SaaS IGA experience, 10+ years in IAM/IGA, strong cybersecurity and systems engineering, Saviynt certification required (or obtain after hire), bachelor’s required, excellent communication and leadership.
Saviynt, REST, SCIM, JDBC, LDAP, SOAP, SQL, Microsoft Entra ID, Active Directory, AWS, Azure, Google Cloud
1mo
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Information Technology (IT) Architect
Scott Air Force Base, Illinois, United States
OnsiteFull Time
5+ YOEActive U.S. citizenship and Secret DoD clearance required; 5+ years IT/systems engineering experience; bachelor's degree or equivalent; expertise in enterprise, cloud, infrastructure, application, data architecture and cybersecurity.
2mo
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Mission Systems Lead Software Architect
Berkeley, Missouri, United States
$178k-$240k/yr OnsiteFull Time
5+ YOE3+ MgmtBachelor's degree, 5+ years software architecture/embedded systems experience, 7+ years programming in C/C++/C#, 3+ years leading technical teams, experience with containerized/distributed architectures, ability to obtain U.S. Secret clearance and be a U.S. Person.
C, C++, C#, Linux, Agile, Open Container Initiative (OCI), Open Mission Systems (OMS), Agile Mission Systems Government Reference Architecture (AMS/GRA), Universal Command and Control Interface (UCI), CodeVue
4d
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Senior Information Systems Architect
Scott Air Force Base, Illinois, United States
$85k-$110k/yr OnsiteFull Time
5+ YOEMA/MS in IT or related field, 5+ years IT experience (may substitute experience for degree), ability to obtain US Secret clearance, strong analytical and communication skills, experience with enterprise architecture and systems engineering.
Microsoft Office, Visio, DoD Architecture Framework (DoDAF), Federal Enterprise Architecture Framework (FEAF), The Open Group Architecture Framework (TOGAF), Business Process Modeling Notation (BPMN)
2mo
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Mission Systems Lead Software Architect
Berkeley, Missouri, United States
$178k-$240k/yr OnsiteFull Time
7+ YOE3+ MgmtBachelor's degree, 7+ years programming in C, C++ or C#, 5+ years software development/architecture for embedded mission systems, 3+ years leading software teams, ability to obtain U.S. Secret clearance and meet U.S. Person export control requirements.
C, C++, C#, Linux, Open Container Initiative (OCI), Agile, Agile Mission Systems Government Reference Architecture (AMS/GRA), Open Mission Systems (OMS), Universal Command and Control Interface (UCI), CodeVue
2mo
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HR Ecosystem Architect
Sidney or St. Louis or Cudahy or Kennesaw
HybridFull Time
8+ YOE8+ years in HR systems architecture with strong Workday expertise; experience with ADP, Dayforce, Kronos, SailPoint, JML automation, integrations (APIs/middleware), SOX compliance, and technical documentation; Bachelor’s degree required.
Workday, ADP, Dayforce, Kronos, SailPoint, APIs, middleware, SSO, Active Directory, HRIS, Workday Integrations
1mo
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Enterprise Data Architect
Clayton or United States
$105k-$124k/yr HybridFull Time
6+ YOEBachelor's in IT or equivalent, 6+ years IT experience (5+ in information system design), 4+ years in data management/modeling/warehousing, 2+ years cloud analytics with Databricks experience; strong data architecture, governance, and communication skills.
Databricks, Delta Lake, Erwin, SqlDBM, PySpark, SQL, Python, Microsoft Office, Microsoft Project, Microsoft Teams
1w
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E-House Solution Architect
Nashville or St. Louis or Raleigh or Seneca or Dallas or Houston or El Paso or Columbia
$142k-$214k/yr HybridFull Time
10+ YOEBachelor's in engineering,10+ years in power systems/modular substations/E-House solutions,experience with proposals and customer engagements,knowledge of standards (NEMA,IEC,IEEE,ANSI,NFPA),willingness to travel 25–50%.
SCADA, PLC, RTU, EcoStruxure
1mo
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Agentic AI Architect - Intelligence Engineering (Central)
Austin or Chicago or Columbus or Dallas or Detroit or Houston or Indianapolis or Kansas City or Minneapolis or Nashville or St. Louis
$108k-$200k/yr HybridFull Time
5+ YOE5+ years software engineering experience with 2+ years focused on generative/agentic AI; experience designing multi-agent systems, RAG, cloud AI platforms, Python, API frameworks, evaluation/observability, and leading small teams.
Amazon Web Services, Azure, Google Cloud, AWS Bedrock, Azure AI Foundry, OpenAI Service, GCP Vertex AI, Gemini, Databricks, Python, FastAPI, Flask, Lang Graph, Strands Agents SDK, OpenAI Agents SDK, Google ADK, LangSmith, RAGAS, DeepEval, Claude Code, Cursor, Kiro, AutoGen, CrewAI, Semantic Kernel, Model Context Protocol (MCP)
1mo
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Senior AI Security Technical Architect
Tempe or St. Louis or Arizona or Missouri or United States
HybridFull Time
12+ YOEBachelor's degree or equivalent experience; 12+ years in cybersecurity engineering/architecture; 4+ years securing AI/ML systems; experience with LLMs, RAG, ML pipelines, cloud security (Azure/AWS/GCP); strong communication and enterprise influence skills.
Azure, AWS, GCP, NIST AI Risk Management Framework (AI RMF), MITRE ATLAS, CIS, ISO 27001, LLM, Retrieval-Augmented Generation (RAG), vector databases
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